diff --git a/app/src/main/java/com/libandexample/Main2Activity.java b/app/src/main/java/com/libandexample/Main2Activity.java
index ed5450e..43fd7bb 100644
--- a/app/src/main/java/com/libandexample/Main2Activity.java
+++ b/app/src/main/java/com/libandexample/Main2Activity.java
@@ -11,9 +11,9 @@
 import java.io.File;
 
 import androidx.annotation.Nullable;
-import androidx.appcompat.app.AppCompatActivity;
 
-public class Main2Activity extends AppCompatActivity {
+
+public class Main2Activity extends Activity {
     private ImageView imageView;
 
     @Override
diff --git a/app/src/main/java/com/libandexample/courses/udemy/Kotlin/findmyage/MainActivity.kt b/app/src/main/java/com/libandexample/courses/udemy/Kotlin/findmyage/MainActivity.kt
index 5731dd9..617a20f 100644
--- a/app/src/main/java/com/libandexample/courses/udemy/Kotlin/findmyage/MainActivity.kt
+++ b/app/src/main/java/com/libandexample/courses/udemy/Kotlin/findmyage/MainActivity.kt
@@ -2,8 +2,8 @@ package com.libandexample.courses.udemy.Kotlin.findmyage
 
 import android.annotation.SuppressLint
 import android.os.Bundle
-import android.view.View
 import androidx.appcompat.app.AppCompatActivity
+import android.view.View
 import com.libandexample.R
 import kotlinx.android.synthetic.main.activity_main.*
 import java.util.*
@@ -25,7 +25,7 @@ class MainActivity : AppCompatActivity() {
         val userDOB: String = etDOB.text.toString()
         val year: Int = Calendar.getInstance().get(Calendar.YEAR)
         val myAge = year - userDOB.toInt()
-        tvShowAge.text = "Your age is " + myAge
+        tvShowAge.setText("Your age is " + myAge)
     }
 
 }
diff --git a/app/src/main/java/com/libandexample/courses/udemy/Kotlin/getsunset/GetSunSetMainActivity.kt b/app/src/main/java/com/libandexample/courses/udemy/Kotlin/getsunset/GetSunSetMainActivity.kt
index 756f3af..5a01b8a 100644
--- a/app/src/main/java/com/libandexample/courses/udemy/Kotlin/getsunset/GetSunSetMainActivity.kt
+++ b/app/src/main/java/com/libandexample/courses/udemy/Kotlin/getsunset/GetSunSetMainActivity.kt
@@ -14,7 +14,7 @@ import java.io.InputStreamReader
 import java.net.HttpURLConnection
 import java.net.URL
 
-open class GetSunSetMainActivity : AppCompatActivity() {
+class GetSunSetMainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
diff --git a/liband/src/main/java/com/liband/BaseActivity.java b/liband/src/main/java/com/liband/BaseActivity.java
index 8729d75..a0e3adb 100644
--- a/liband/src/main/java/com/liband/BaseActivity.java
+++ b/liband/src/main/java/com/liband/BaseActivity.java
@@ -45,7 +45,7 @@ public void onClick(View v) {
 
 
     public void addFragment(int containerViewId, Fragment newFragment) {
-        final FragmentManager manager = getSupportFragmentManager();
+        final FragmentManager manager = this.getSupportFragmentManager();
         final FragmentTransaction transaction = manager.beginTransaction();
         transaction.add(containerViewId, newFragment, newFragment.getClass().getSimpleName());
         transaction.commitAllowingStateLoss();
diff --git a/liband/src/main/java/com/liband/utils/ExceptionHandler.java b/liband/src/main/java/com/liband/utils/ExceptionHandler.java
index eb9e72e..21996dc 100644
--- a/liband/src/main/java/com/liband/utils/ExceptionHandler.java
+++ b/liband/src/main/java/com/liband/utils/ExceptionHandler.java
@@ -1,16 +1,15 @@
 package com.liband.utils;
 
+import android.app.Activity;
 import android.os.Build;
 import android.util.Log;
 
 import java.io.PrintWriter;
 import java.io.StringWriter;
 
-import androidx.appcompat.app.AppCompatActivity;
-
 public class ExceptionHandler implements Thread.UncaughtExceptionHandler {
 
-    public ExceptionHandler(AppCompatActivity context) {
+    public ExceptionHandler(Activity context) {
     }
 
     public void uncaughtException(Thread thread, Throwable exception) {
diff --git a/liband/src/main/java/com/liband/utils/IntentUtils.java b/liband/src/main/java/com/liband/utils/IntentUtils.java
index a5feb14..00074fa 100644
--- a/liband/src/main/java/com/liband/utils/IntentUtils.java
+++ b/liband/src/main/java/com/liband/utils/IntentUtils.java
@@ -1,11 +1,12 @@
 package com.liband.utils;
 
+import android.app.Activity;
 import android.content.ActivityNotFoundException;
 import android.content.Intent;
 import android.net.Uri;
 import android.widget.Toast;
 
-import androidx.appcompat.app.AppCompatActivity;
+
 
 
 public class IntentUtils {
@@ -67,7 +68,7 @@ public static void openInstagramPage(Context context, String username) {
     }
     */
 
-    private static void openWebPage(AppCompatActivity activity, String url) {
+    private static void openWebPage(Activity activity, String url) {
         try {
             Uri webpage = Uri.parse(url);
             Intent myIntent = new Intent(Intent.ACTION_VIEW, webpage);
@@ -78,7 +79,7 @@ private static void openWebPage(AppCompatActivity activity, String url) {
         }
     }
 
-    public static void openFacebook(AppCompatActivity activity, String username) {
+    public static void openFacebook(Activity activity, String username) {
         try {
             Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("fb://page/" + username));
             activity.startActivity(myIntent);
@@ -88,7 +89,7 @@ public static void openFacebook(AppCompatActivity activity, String username) {
         }
     }
 
-    public static void openInstagram(AppCompatActivity activity, String username) {
+    public static void openInstagram(Activity activity, String username) {
         try {
             Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("instagram://user?username=" + username));
             activity.startActivity(myIntent);
@@ -98,7 +99,7 @@ public static void openInstagram(AppCompatActivity activity, String username) {
         }
     }
 
-    public static void openTwitter(AppCompatActivity activity, String username) {
+    public static void openTwitter(Activity activity, String username) {
         try {
             Intent myIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("twitter://user?screen_name=" + username));
             activity.startActivity(myIntent);
diff --git a/liband/src/main/java/com/liband/utils/SnackbarUtils.java b/liband/src/main/java/com/liband/utils/SnackbarUtils.java
index 99288ad..5941aff 100644
--- a/liband/src/main/java/com/liband/utils/SnackbarUtils.java
+++ b/liband/src/main/java/com/liband/utils/SnackbarUtils.java
@@ -1,5 +1,6 @@
 package com.liband.utils;
 
+import android.app.Activity;
 import android.graphics.Color;
 import android.view.View;
 import android.widget.TextView;
@@ -7,7 +8,6 @@
 import com.google.android.material.snackbar.Snackbar;
 import com.liband.R;
 
-import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.content.ContextCompat;
 
 
@@ -15,7 +15,7 @@ public class SnackbarUtils {
 
     private static Snackbar snackbar;
 
-    public static void loadSnackBar(String message, AppCompatActivity activity, int color) {
+    public static void loadSnackBar(String message, Activity activity, int color) {
         if (activity != null) {
             snackbar = Snackbar.make(
                     activity.findViewById(android.R.id.content), message,
@@ -42,7 +42,7 @@ public static void loadSnackBar(String message, AppCompatActivity activity, int
     }
 
 
-    public static void loadSnackBar(final View view, String message, AppCompatActivity activity, int color) {
+    public static void loadSnackBar(final View view, String message, Activity activity, int color) {
         if (activity != null) {
             snackbar = Snackbar.make(
                     view, message,
diff --git a/liband/src/main/java/com/liband/utils/Utils.java b/liband/src/main/java/com/liband/utils/Utils.java
index 616b3df..efac6e5 100644
--- a/liband/src/main/java/com/liband/utils/Utils.java
+++ b/liband/src/main/java/com/liband/utils/Utils.java
@@ -1,5 +1,6 @@
 package com.liband.utils;
 
+import android.app.Activity;
 import android.app.Application;
 import android.content.Context;
 import android.content.res.Resources;
@@ -10,7 +11,6 @@
 
 import java.util.Objects;
 
-import androidx.appcompat.app.AppCompatActivity;
 
 public class Utils {
 
@@ -37,11 +37,11 @@ public static String getDeviceName() {
     }
 
     public static void hideSoftKeyboard(Context mActivity) {
-        if (mActivity != null && !((AppCompatActivity) mActivity).isFinishing()) {
-            final InputMethodManager inputMethodManager = (InputMethodManager) mActivity.getSystemService(AppCompatActivity.INPUT_METHOD_SERVICE);
+        if (mActivity != null && !((Activity) mActivity).isFinishing()) {
+            final InputMethodManager inputMethodManager = (InputMethodManager) mActivity.getSystemService(Activity.INPUT_METHOD_SERVICE);
             if (Objects.requireNonNull(inputMethodManager).isActive()) {
-                if (((AppCompatActivity) mActivity).getCurrentFocus() != null) {
-                    inputMethodManager.hideSoftInputFromWindow(Objects.requireNonNull(((AppCompatActivity) mActivity).getCurrentFocus()).getWindowToken(), 0);
+                if (((Activity) mActivity).getCurrentFocus() != null) {
+                    inputMethodManager.hideSoftInputFromWindow(Objects.requireNonNull(((Activity) mActivity).getCurrentFocus()).getWindowToken(), 0);
                 }
             }
         }